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Journal Articles

Spectrum prediction in X-ray fluorescence analysis using Bayesian estimation

Matsuyama, Tsugufumi*; Nakae, Masanori*; Murakami, Masashi; Yoshida, Yukihiko; Machida, Masahiko; Tsuji, Koichi*

Spectrochimica Acta, Part B, 199, p.106593_1 - 106593_6, 2023/01

https://doi.org/10.1016/j.sab.2022.106593
 Times Cited Count：0 Percentile：34.26(Spectroscopy)

Journal Articles

Development and evaluation of XRF imaging instrument for moving objects

Fuchita, Tomoki*; Urata, Taisei*; Matsuyama, Tsugufumi*; Murakami, Masashi; Yoshida, Yukihiko; Ueda, Akihiko; Machida, Masahiko; Sasaki, Toshiki; Tsuji, Koichi*

X-sen Bunseki No Shimpo, 53, p.77 - 87, 2022/03

X-ray fluorescence (XRF) analysis is an analytical method to obtain elemental information by detecting fluorescence X-rays emitted from a sample irradiated with X-rays. It is possible to obtain two-dimensional elemental distribution images by scanning a sample with micro X-ray beam. In this study, we developed an XRF analytical instrument to rapidly obtain the elemental distributions for moving samples on a belt conveyor by applying the micro XRF technique. X-rays were widely irradiated to the belt conveyor. The elemental distributions were measured by scanning an X-ray detector, crossing above the belt conveyor. A collimator was attached to the top of the detector to limit the analyzing area. Both detection limit and spatial resolutions for moving directions of the detector and the belt conveyor were evaluated. Finally, it was demonstrated that the multi-elemental imaging was possible with the developed XRF instrument.

JAEA Reports

Basic policy for rational measures of radioactive waste processing and disposal; Results of studies for acceleration of waste processing

Nakagawa, Akinori; Oyokawa, Atsushi; Murakami, Masashi; Yoshida, Yukihiko; Sasaki, Toshiki; Okada, Shota; Nakata, Hisakazu; Sugaya, Toshikatsu; Sakai, Akihiro; Sakamoto, Yoshiaki

JAEA-Technology 2021-006, 186 Pages, 2021/06

JAEA-Technology-2021-006.pdf:54.45MB

Radioactive wastes generated from R&D activities have been stored in Japan Atomic Energy Agency. In order to reduce the risk of taking long time to process legacy wastes, countermeasures for acceleration of waste processing and disposal were studied. Work analysis of waste processing showed bottleneck processes, such as evaluation of radioactivity concentration, segregation of hazardous and combustibles materials. Concerning evaluation of radioactivity concentration, a radiological characterization method using a scaling factor and a nondestructive gamma-ray measurement should be developed. The number of radionuclides that are to be selected for the safety assessment of the trench type disposal facility can decrease using artificial barriers. Hazardous materials, will be identified using records and nondestructive inspection. The waste identified as hazardous will be unpacked and segregated. Preliminary calculations of waste acceptance criteria of hazardous material concentrations were conducted based on environmental standards in groundwater. The total volume of the combustibles will be evaluated using nondestructive inspection. The waste that does not comply with the waste acceptance criteria should be mixed with low combustible material waste such as dismantling concrete waste in order to satisfy the waste acceptance criteria on a disposal facility average. It was estimated that segregation throughput of compressed waste should be increased about 5 times more than conventional method by applying the countermeasures. Further study and technology development will be conducted to realize the plan.

Journal Articles

Local disorder in proton conductor BaSn$$_{0.5}$$In$$_{0.5}$$O$$_{2.75}$$ analyzed by neutron diffraction/ atomic pair distribution function

Igawa, Naoki; Kodama, Katsuaki; Taguchi, Tomitsugu*; Yoshida, Yukihiko*; Matsukawa, Takeshi*; Hoshikawa, Akinori*; Ishigaki, Toru*

Transactions of the Materials Research Society of Japan, 43(6), p.329 - 332, 2018/12

https://doi.org/10.14723/tmrsj.43.329

For the understanding of the crystal structural effect on the electrical properties, the local disorder in BaSn$$_{0.5}$$In$$_{0.5}$$O$$_{2.75}$$ which is one of the excellent proton conductors for solid oxide fuel cells was estimated by using the Atomic Pair Distribution Function (PDF) analysis method with the neutron diffraction. The local structure is almost the same as the average structure which was estimated by the Rietveld analysis using the cubic crystal structure (space group, $${it Pm}$$$$overline{3}$$$${it m}$$) in the atomic distance range of ${it r}$ $$>$$ 6${AA}$. The PDF profile was fitted better using the tetragonal crystal structure with the space group of ${it P}$4/${it mmm}$ than those with $${it Pm}$$$$overline{3}$$$${it m}$$ in the range ${it r}$ $$<$$ 6${AA}$. Those results indicate the presence of the local disorder in the lattice. In this work, the relationship between the average and local structures of BaSn$$_{0.5}$$In$$_{0.5}$$O$$_{2.75}$$ will be discussed.

Journal Articles

Time-of-flight elastic and inelastic neutron scattering studies on the localized 4d electron layered perovskite La$$_5$$Mo$$_4$$O$$_{16}$$

Iida, Kazuki*; Kajimoto, Ryoichi; Mizuno, Yusuke*; Kamazawa, Kazuya*; Inamura, Yasuhiro; Hoshikawa, Akinori*; Yoshida, Yukihiko*; Matsukawa, Takeshi*; Ishigaki, Toru*; Kawamura, Yukihiko*; et al.

Journal of the Physical Society of Japan, 86(6), p.064803_1 - 064803_6, 2017/06

https://doi.org/10.7566/JPSJ.86.064803
 Times Cited Count：1 Percentile：12.36(Physics, Multidisciplinary)

Oral presentation

Design study for flow around pump shaft of Integrated IHX/pump of fast reactor JSFR, 1; Study of pump shaft deformation by natural convection of cover gas

Enuma, Yasuhiro; Handa, Takuya; Shimazaki, Masanori*; Ono, Yukihiko*; Yoshida, Kazuhiro*; Hayakawa, Satoshi*; Inoue, Tomoyuki*

no journal, , 

no abstracts in English

Oral presentation

Magnetic phase diagrams of Cs$$_{2}$$Cu$$_{2}$$Mo$$_{3}$$O$$_{12}$$ below 2 K with CuO$$_{2}$$ ribbon chains

Fujimura, Akio*; Yasui, Yukio*; Igawa, Naoki; Yoshida, Yukihiko*; Ishigaki, Toru*; Kono, Yohei*; Kittaka, Shunichiro*; Sakakibara, Toshiro*

no journal, , 

Magnetic phase diagram was investigated by the specific heat measurement and magnetic structure has been studied by using neutron diffraction for Cs$$_{2}$$Cu$$_{2}$$Mo$$_{3}$$O$$_{12}$$ with CuO$$_{2}$$ ribbon chains. We found that this material showed antiferromagnetic transition at T$$_{N}$$ = 1.85 K under 0 magnetic field. The difference in magnetic and crystal structure between Cs$$_{2}$$Cu$$_{2}$$Mo$$_{3}$$O$$_{12}$$ and Rb$$_{2}$$Cu$$_{2}$$Mo$$_{3}$$O$$_{12}$$ are discussed.

Oral presentation

Magnetic properties and crystal structure of honeycomb lattice system Li$$_{3}$$Ni$$_{2}$$SbO$$_{6}$$

Fukui, Akito*; Yasui, Yukio*; Igawa, Naoki; Matsukawa, Takeshi*; Yoshida, Yukihiko*; Hoshikawa, Akinori*; Ishigaki, Toru*

no journal, , 

The powder neutron crystal structure analysis and measurements of the magnetization and the specific heat have been carried out for the honeycomb lattice spin system Li$$_{3}$$Ni$$_{2}$$SbO$$_{6}$$. From the Rietveld analysis of the neutron diffraction data, we determined the crystal structure of Li$$_{3}$$Ni$$_{2}$$SbO$$_{6}$$, where the space group is ${it C}$ 2/${it m}$ monoclinic and the distortion from ideal honeycomb lattice is $$sim$$0.1 % only. The Weiss temperature $$theta_mathrm{w}$$ obtained from the temperature dependence of magnetic susceptibility is 12.2 K, indicating that dominant interaction between the Ni$$^{2+}$$ spins is ferromagnetic one. However, from the behavior of the magnetic susceptibility and the specific heat, Li$$_{3}$$Ni$$_{2}$$SbO$$_{6}$$ is found to exhibit an antiferromagnetic transition at $$T_mathrm{N}$$ = 13.5 K.

Oral presentation

Development of rapid texture measurement in iMATERIA

Onuki, Yusuke*; Hoshikawa, Akinori*; Yoshida, Yukihiko*; Matsukawa, Ken*; Ishigaki, Toru*; Xu, P. G.

no journal, , 

no abstracts in English

Oral presentation

Magnetic behavior and magnetic structure of CuO$$_{2}$$ ribbon system A$$_{2}$$Cu$$_{2}$$Mo$$_{3}$$O$$_{12}$$ (A=Rb, Cs)

Fujimura, Akio*; Yasui, Yukio*; Kono, Yohei*; Kittaka, Shunichiro*; Sakakibara, Toshiro*; Igawa, Naoki; Matsukawa, Takeshi*; Yoshida, Yukihiko*; Hoshikawa, Akinori*; Ishigaki, Toru*

no journal, , 

The magnetic behavior and magnetic structure of A$$_{2}$$Cu$$_{2}$$Mo$$_{3}$$O$$_{12}$$ (A=Rb, Cs) with CuO$$_{2}$$ ribbon chains have been studied by using specific heat measurement and neutron diffraction method. Cs$$_{2}$$Cu$$_{2}$$Mo$$_{3}$$O$$_{12}$$ showed collinear-antiferromagnetic structure analyzed by the neutron diffraction. The relation between magnetic behavior and magnetic for those materials are discussed.

Oral presentation

Average and local structures of BaSn$$_{0.5}$$In$$_{0.5}$$O$$_{2.75}$$ as electrolyte for solid oxide fuel cell analyzed by neutron diffraction

Igawa, Naoki; Kodama, Katsuaki; Taguchi, Tomitsugu*; Yoshida, Yukihiko*; Matsukawa, Takeshi*; Hoshikawa, Akinori*; Ishigaki, Toru*

no journal, , 

The average and local structures of BaSn$$_{0.5}$$In$$_{0.5}$$O$$_{2.75}$$ which is one of the excellent solid electrolytes for solid oxide fuel cells were analyzed by using the Rietveld method and the Atomic Pair Distribution Function (PDF) analysis method with the neutron diffraction to research the crystal structural effect on the electrical properties. PDF profile which was obtained from the neutron diffraction data of BaSn$$_{0.5}$$In$$_{0.5}$$O$$_{2.75}$$ was fitted by using the crystal structure with the space group, ${it Pm}$-3${it m}$ which corresponds with the average structure, and the fitting relatively good reproduces the observed data. In this work, the relationship between the average and local structures of hydrogen doped and undoped BaSn$$_{0.5}$$In$$_{0.5}$$O$$_{2.75}$$ will be discussed.

Oral presentation

Magnetic structure of one-dimensional frustrated quantum spin system Cs$$_{2}$$Cu$$_{2}$$Mo$$_{3}$$O$$_{12}$$

Yasui, Yukio*; Fujimura, Akio*; Omori, Kiyoshi*; Igawa, Naoki; Matsukawa, Takeshi*; Yoshida, Yukihiko*; Hoshikawa, Akinori*; Ishigaki, Toru*

no journal, , 

The magnetic structure of Cs$$_{2}$$Cu$$_{2}$$Mo$$_{3}$$O$$_{12}$$ with CuO$$_{2}$$ ribbon chains have been studied by using the neutron powder diffraction. The magnetic reflections were observed below $$T_mathrm{N}$$ = 1.85 K and all of the magnetic reflections overlapped Bragg reflections. Considering that these are 16-Cu$$^{2+}$$ ions in the unit cell, Cs$$_{2}$$Cu$$_{2}$$Mo$$_{3}$$O$$_{12}$$ has the collinear-antiferromagnetic structure.

Oral presentation

Magnetic properties of RCrTiO$$_{5}$$ (R=rare earth elements)

Yasui, Yukio*; Miyamoto, Takuma*; Kori, Shunsuke*; Terasaki, Ichiro*; Yoshizawa, Daichi*; Mitsuru, Akaki*; Hagiwara, Masayuki*; Matsukawa, Takeshi*; Yoshida, Yukihiko*; Hoshikawa, Akinori*; et al.

no journal, , 

We have measured the specific heat and magnetization up to 50 T of polycrystalline samples of RCrTiO$$_{5}$$ (R=Pr, Nd, Eu, Sm and Gd) and also carried out powder neutron diffraction experiments of NdCrTiO$$_{5}$$ and Nd$$_{0.5}$$Pr$$_{0.5}$$CrTiO$$_{5}$$. From the analyses of specific heat data and magnetization curves up to 50 T of the systems, we have evaluated the magnetic interactions between the Cr$$^{3+}$$ - Cr$$^{3+}$$ magnetic moments and between the Cr$$^{3+}$$ -R$$^{3+}$$ ones. The temperature dependence of neutron magnetic reflection intensities of NdCrTiO$$_{5}$$ indicate that both the Cr$$^{3+}$$-moments and the Nd$$^{3+}$$-moments simultaneously order at $$T_mathrm{N}$$. Basis of the obtained magnetic behavior, the mechanism of magnetoelectric effect of RCrTiO$$_{5}$$ will be discussed.

Oral presentation

Magnetic structure of 1D quantum spin system Cs$$_{2}$$Cu$$_{2}$$Mo$$_{3}$$O$$_{12}$$ with $$J_1$$ - $$J_2$$ model

Yasui, Yukio*; Fujimura, Akio*; Omori, Kiyoshi*; Igawa, Naoki; Matsukawa, Takeshi*; Yoshida, Yukihiko*; Hoshikawa, Akinori*; Ishigaki, Toru*

no journal, , 

The magnetic structure of Cs$$_{2}$$Cu$$_{2}$$Mo$$_{3}$$O$$_{12}$$ has been studied by using the neutron powder diffraction. Cu$$^{2+}$$ spins collinearly ordinate along the ${it b}$ axis and we found that this material has ferromagnetic structure in ribbon chains and antiferromagnetic structure between ribbon chains. Those results indicate that the magnetic structure is strongly inflected with ferromagnetic $$J_1$$. In this presentation, the detail of magnetic structure of this material will be discussed.

Oral presentation

Development of waste recognition system using Artificial Intelligence (AI)

Yoshida, Yukihiko; Sasaki, Toshiki; Murakami, Masashi

no journal, , 

Applications of AI for waste processing are widely considered from the rational viewpoints at JAEA. One useful plan is the application of AI to waste segregation in waste pretreatment. In waste segregating process, there are problems such as high cost of waste segregation, large amount of work, and possibility of worker exposure. The AI solutions of these problems can be expected from the remarkable progress of AI recognition techniques in recent years. In this presentation, we report the application results of AI for object recognition of waste by image.

Oral presentation

Basic study on X-ray absorption elemental imaging with secondary targets

Nakae, Masanori*; Matsuyama, Tsugufumi*; Murakami, Masashi; Yoshida, Yukihiko; Ueda, Akihiko; Machida, Masahiko; Sasaki, Toshiki; Tsuji, Koichi*

no journal, , 

no abstracts in English

Oral presentation

Development of X-ray fluorescence imaging system for moving objects

Fuchita, Tomoki*; Matsuyama, Tsugufumi*; Murakami, Masashi; Yoshida, Yukihiko; Ueda, Akihiko; Machida, Masahiko; Sasaki, Toshiki; Tsuji, Koichi*

no journal, , 

no abstracts in English

Oral presentation

Fundamental study for elemental identification method by X-ray absorption imaging using a secondary target

Nakae, Masanori*; Matsuyama, Tsugufumi*; Murakami, Masashi; Yoshida, Yukihiko; Machida, Masahiko; Ueda, Akihiko; Sasaki, Toshiki; Tsuji, Koichi*

no journal, , 

X-ray absorption imaging is a technique in which samples are irradiated with X-rays and the transmitted X-rays are detected by an X-ray camera. Although this method is non-destructive and fast, X-ray cameras generally do not have energy resolution and cannot identify elements. Recently, an X-ray imaging method has been reported to use synchrotron radiation to image the elemental distribution using X-rays with energy around the absorption edge, and analyze the difference between the images. However, it is difficult to change the energy of X-rays in a laboratory. In this study, we studied the method for visualization of only the target element even in the laboratory by using a secondary target and an X-ray filter.

Oral presentation

Basic study about prediction of X-ray fluorescence spectra based on Bayesian estimation

Matsuyama, Tsugufumi*; Nakae, Masanori*; Murakami, Masashi; Yoshida, Yukihiko; Machida, Masahiko; Tsuji, Koichi*

no journal, , 

no abstracts in English

Oral presentation

Development of nondestructive identification method by using high-energy X-ray CT for disposal-restricted materials in radioactive waste containers

Murakami, Masashi; Yoshida, Yukihiko; Nango, Nobuhito*; Kubota, Shogo*; Kurosawa, Takuya*; Sasaki, Toshiki

no journal, , 

no abstracts in English

Oral presentation

Studies of machine learning techniques toward rapid analysis of X-ray fluorescence spectra

Machida, Masahiko; Murakami, Masashi; Yoshida, Yukihiko; Sasaki, Toshiki; Tanimura, Naoki*

no journal, , 

no abstracts in English

21 (Records 1-20 displayed on this page)